Energiberäkning på Sjösäkerhetsanordningar : Energikartläggning och beräkningsverktyg för ljus

Sammanfattning: On behalf of the Swedish marine authority this report has been carried out with the purpose of partly making an energy survey on existing lightning devices, but also creating a user-friendly calculation program. 600 pcs. of light devices (light bouys and light dots), that all use alkaline unchargeable batteries, was used in the energy survey. All devices are located around the Swedish fairways. The calculation program was created on the basis of specific terms regarding calculating light intensity, as today’s method is deficient and inconsistent.   As result a calculation program was developed which makes it possible for the user to calculate, with known input data, the specific capacity needed for a battery regarding the period of time in use. The same method used in the calculation program was also used in the energy survey. With reference to the survey a large part of the purchased battery capacity is not being used. Batteries worth around SEK 800,000 are annually purchased and the report shows that, with a marginal for change of 3 months, a total saving of SEK 300, 000 could be made annually.   As of today the amount of unchargeable battieris purchased are to high, which the figures above shows. In order to reduce the usage of batteries better planned routes, increased knowledge about energy and better tools for calculation is needed. This work has contributed to the increase of knowledge and a user-friendly calculation program.